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Author Topic: Big Block Exhaust Manifold Bolts  (Read 2432 times)

Bigfish45

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Big Block Exhaust Manifold Bolts
« on: June 09, 2021, 01:49:00 PM »
Does anyone have a picture of the correct markings on original 1969 Camaro big block exhaust manifold bolts?
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69Z28-RS

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Re: Big Block Exhaust Manifold Bolts
« Reply #1 on: June 09, 2021, 02:46:55 PM »
I believe they would be the 'std' 'double circle marked bolt heads...   Paragon Corvette has these in kits..

https://www.paragoncorvette.com/p-355204-exhaust-manifold-bolt-stud-kit.aspx
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69 Corvette, '60 Corvette, '72 Corvette
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x66 714

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Re: Big Block Exhaust Manifold Bolts
« Reply #2 on: June 09, 2021, 03:52:34 PM »
I can't see the heads on these bolts but most of mine have the double circle with 6 lines (grsde 8) going from the inner circle to the outer circle. My engine was built 08/21/1969. That doesn't mean that's correct for your engine as they bought bolts from different supplier....Joe
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See America's First, Chevrolet

1968 Z/28 Corvette Bronze. Black Hounds Tooth. 02E Los Angeles born 3/13/1968 pnt OO. Purchased March 1976
1969 SS396 Yellow/Yellow 08E Norwood born 8/28/1969 pnt 76E. Purchased April 1981

firstgenaddict

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Re: Big Block Exhaust Manifold Bolts
« Reply #3 on: June 10, 2021, 12:00:09 AM »
Big blocks use 2 different bolts one with a flange and one without the flange. 
Cylinders 1 and 7 - 2 and 8 use bolts with flanges
Cylinders 3 and 5 - 4 and 6 use bolts without flanges.


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James
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